当所测电阻阻值比较大，用伏安法测量电阻时，电压表宜采用的是（    ）。

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SQL Error: select id,body,options from ***_enewstiku_ where sourceid='68474' and id < 4421080 and id<>'4421080' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='68474' and id > 4421080 and id<>'4421080' order by id asc limit 5